Gregory gerdom



(No Model.)

G. GERDOM. TOOL FOR BORING BREEOH LOADING ORDNANGE. No. 466,869. Patented Jan. 12, 1892.

fis.$. Heb. Wrrnzssss: INVENTORIE GREGORY GERDOM, BY MM ATTORNEY.

' UNrrnn STATES PATENT FFICE.

GREGORY GERDOM, OF \VEST TROY, NEV YORK, ASSIGNOR OF ONE-HALF TO JOHN H. REYNOLDS, OF SAME PLACE.

TOOL FOR BORING BREECH-LOADING ORDNANCE.

SPECIFICATION forming part of Letters Patent No. 466,869, dated. January 12, 1892.

Application filed September 15, i891 Serial No. 405,744- (No model.)

[" ctZZ whom it may concern:

Be it known that I, GREGORY Gannon, of

"lVest Troy, in the county of Albany and State ion of the bore has been occasioned by the provided with my improvements.

view.

lefectivenes's of the cutter mechanism used for boring the guns. The object of my invention is to remedy these defects; and I attain this object by the means illustrated in the accompanying drawngs, which are herein referred to and form iart of this specification, and in which- Figure 1 is a side elevation of a cutter-head Fig. 2 is Fig. 3 is a plan Fig. at is a side elevation of said outter-head with one of the cheek-blocks removed therefrom. Fig. 5 is an enlarged and detached side elevation of my improved form of cutter, and Fig. 6 is an end elevation of said cutter.

As represented in the drawings, A designates my cutter-head, which is generally made of cast metal and is provided with a shank l or other suitable means for securing said outter-head to the end of a cutter-bar of the form commonly used for boring breech-loading ordnance. Said shank projects from the end of a cylindrical portion 2 of said cutterhead. A flattened portion 3 of said cutterhead extends longitudinally from said cylindrical portion, and each plane face of said flattened portion is provided with a longitudinal tongue at, and said tongues are preferably arranged to be diametrically opposite to each other. head rectangular recesses 5 are formed for receiving the detachable cutters for said outter-head. The back of each of said recesses constitutes a seat for attaching one of said cutters thereto, and each of said backs ranges on the diametrical center line of said cutterhead in such manner that the two recesses will be located at opposite sides of said line an end elevation of the same.

.erly performed its work.

At the outer extremity of said cutter-- and, as shown in Fig. 2, at opposite edges of the flattened portion of said cutter-head.

B designates the cutters for my cutter-head.

Said cutters are made of steel in the form of flat plates, which, after being properly shaped, are tempered to the required degree of hardness to effect the cutting away of the metal in the process of boring the gun. The finishing part 6 of said cutter is made parallel to the center line of the cutter-head A and of such size that when secured in place on said outter-head it will bore the gun to the required caliber, and the leading part 7 of said cutter is slightly inclined toward the center line of the cutter-head A, whereby said cutter-head and cutters are adapted to enter the primary bore of the gun and effect the finishing cut of the bore of the gun, the tapering portion of the cutters B effecting the removal of the surplus metal and the straight portion of said cutters effecting the finishing of the bore of the gun to the required caliber in a very smooth and perfect manner. A groove 8, which follows the outline of the parts 6 and 7, is

width, as at 9, to give suflicient clearance for the cutters to prevent injury to the bore of the gun after the finishing part 6 has propters is secured in the recess 5 appropriated thereto by means of bolts 10, and each of the cutters is provided with bolt-holes 11, which are slotted toward the edges of the cutters, so

as to allow the latter to be adjusted from and toward the center line of the cutter-head A.

O designates the clieeleblocks, which are preferably made of wood and secured by means of bolts 12 to the opposite flat faces of the flattened portion 3 of the cutter head A. 5

Said bolts are inserted in counterbored holes 13 in said cheek-blocks and pass through boltholes 14- in the cutter-head A. The face of each cheek-block which comes in contact with the flattened portion of the cutter-head is provided with a longitudinal groove that flts snugly onto the tongue 4: of the correspond- Immediately following the finishing 80 part of each cutter the latter is reduced in Each of said cut- 8 ing side of said cutter-head. After the cheekblocks 0 are properly secured to the cutterhead A they should be turned off to the exact diameter to which the bore of the gun is to be finished, whereby the segments of a cylin (her, as shown in Fig. 2, will be produced, and said segments, by fitting snugly into the bore of the gun, will hold the cutter-head in a steady positiomand thereby prevent the production of a chattering cut in the bore of the gun.

My improvements are specially designed for boring breech-loading ordnance made of steel or wrought-iron in which a preliminary bore less in diameter than the finished bore of the gun has been made longitudinally through the entire length of the forging for the gun. Said preliminary bore of said forging should be sufficiently large to permit the contracted end of the cutt ers B,when attached {)0 the cutter-head A, to enter freely into said ore.

What I claim as my invention, and desire to secure by Letters Patent, is-

1. In a tool for boring ordnance, a cutter which has at its foremost end a cutting-edge that is slightly inclined to the line of the central axis of said tool and immediately succeedface of the cutter to conform to the outline of" the corresponding edge of said cutter, as and for the purpose herein specified.

2. In a tool for boring ordnance, the combination of a cutter-head having a flattened portion whose opposite faces are each provided with a tongue or rib arranged longitudinally thereon, each of said faces having a recess for containing a cutter, removable cutters secured in said recesses by means of screws or bolts, and segmental cheek-blocks Whose flat faces are provided with longitudinal grooves fitted to engage on the tongue of saidcutter-head, said cheek-blocks being secured to said cutter-head by means of bolts and being turned to conform to the caliber of the gun for which it is used, as and for the purpose herein specified.

GREGORY GERDOM.

Witnesses:

J. H. REYNOLDS, WM. H. Low.

It is hereby certified that the residence of the assignee in Letters Patent No. 466,869, granted January [2, 1892, upon the application of Gregory Gerdom, of VVe'st Troy,

New York, for an improvement in Tools for Boring Breech-Loading Ordnance, was

erroneously Wrtten and printed of same place, whereas said residence should have been written and printed Troy, New York,- and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in thePatent Office.

Signed, countersigned, and sealed this 2d day of February, A. D. 1892.

OYRUS IBUSSEY, Assistant Secretary of the Interior,

[SEAL] Oountersigned W. E. Snrronns,

Cmmnissioner of Patents. 

